Illinois Statutes Chapter 20. Executive Branch § 1807/5. Article 5. Territorial applicability of this Code

(a) This Code has applicability at all times and in all places, provided that there is jurisdiction over the person pursuant to subsection (a) of Article 2; however, this grant of military jurisdiction shall neither preclude nor limit civilian jurisdiction over an offense, which is limited only by subsection (b) of Article 2 and the prohibition of double jeopardy.

(b) Courts-martial and courts of inquiry may be convened and held in units of the State military forces while those units are serving outside this State with the same jurisdiction and powers as to persons subject to this Code as if the proceedings were held inside this State, and offenses committed outside this State may be tried and punished either inside or outside this State.